Caveat!
It took me almost an hour to figure this out, so I hope it saves at least one of you some time.
If you want to debug your DOM tree and try var_dump() or similar you will be fooled into thinking the DOMElement that you are looking at is empty, because var_dump() says: object(DOMElement)#1 (0) { }
After much debugging I found out that all DOM objects are invisible to var_dump() and print_r(), my guess is because they are C objects and not PHP objects. So I tried saveXML(), which works fine on DOMDocument, but is not implemented on DOMElement.
The solution is simple (if you know it):
$xml = $domElement->ownerDocument->saveXML($domElement);
This will give you an XML representation of $domElement.
A classe DOMElement
(PHP 5, PHP 7, PHP 8)
Resumo da classe
/* Propriedades */
/* Propriedades herdadas */
/* Métodos */
/* Métodos herdados */
public DOMNode::C14N(
bool
bool
?array
?array
): string|false
}bool
$exclusive = false,bool
$withComments = false,?array
$xpath = null,?array
$nsPrefixes = null): string|false
Propriedades
- childElementCount
-
O número de elementos filhos.
- firstElementChild
-
O primeiro elemento filho ou
null. - lastElementChild
-
O último elemento filho ou
null. - nextElementSibling
-
O próximo elemento irmão ou
null. - previousElementSibling
-
O elemento irmão anterior ou
null. - schemaTypeInfo
-
Ainda não implementado, sempre retorna
null - tagName
-
O nome do elemento
- className
-
Uma string representando as classes do elemento separadas por espaços
- id
-
O ID do elemento
Registro de Alterações
| Versão | Descrição |
|---|---|
| 8.0.0 | As propriedades firstElementChild, lastElementChild, childElementCount, previousElementSibling, e nextElementSibling foram adicionadas. |
| 8.0.0 | DOMElement implementa DOMParentNode e DOMChildNode agora. |
Notas
Nota:
A extensão DOM usa codificação UTF-8. Use mb_convert_encoding(), UConverter::transcode() ou iconv() para lidar com outras codificações.
Índice
- DOMElement::after — Adiciona nós após o elemento
- DOMElement::append — Adiciona nós após o último nó filho
- DOMElement::before — Adiciona nós antes do elemento
- DOMElement::__construct — Cria um novo objeto DOMElement
- DOMElement::getAttribute — Retorna o valor do atributo
- DOMElement::getAttributeNames — Obtém nomes de atributos
- DOMElement::getAttributeNode — Retorna o nó do atributo
- DOMElement::getAttributeNodeNS — Retorna o nó do atributo
- DOMElement::getAttributeNS — Retorna o valor do atributo
- DOMElement::getElementsByTagName — Obtém elementos pelo nome da tag
- DOMElement::getElementsByTagNameNS — Obtém elementos por namespaceURI e localName
- DOMElement::hasAttribute — Verifica se o atributo existe
- DOMElement::hasAttributeNS — Verifica se o atributo existe
- DOMElement::insertAdjacentElement — Insere um elemento adjacente
- DOMElement::insertAdjacentText — Insere texto adjacente
- DOMElement::prepend — Adiciona nós antes do primeiro nó filho
- DOMElement::remove — Remove o elemento
- DOMElement::removeAttribute — Remove atributo
- DOMElement::removeAttributeNode — Remove atributo
- DOMElement::removeAttributeNS — Remove atributo
- DOMElement::replaceChildren — Substitui filhos no elemento
- DOMElement::replaceWith — Substitui o elemento por novos nodes
- DOMElement::setAttribute — Adiciona ou modifica um atributo existente
- DOMElement::setAttributeNode — Adiciona um novo nó de atributo ao elemento
- DOMElement::setAttributeNodeNS — Adiciona um novo nó de atributo ao elemento
- DOMElement::setAttributeNS — Adiciona um novo atributo
- DOMElement::setIdAttribute — Declara que o atributo especificado pelo nome é do tipo ID
- DOMElement::setIdAttributeNode — Declara que o atributo especificado pelo nó é do tipo ID
- DOMElement::setIdAttributeNS — Declara que o atributo especificado pelo nome local e pelo URI do namespace é do tipo ID
- DOMElement::toggleAttribute — Alterna atributo
add a note
User Contributed Notes 13 notes
j DOT wagner ( AT ) medieninnovation.com ¶
16 years ago
Pinochet ¶
16 years ago
Hi to get the value of DOMElement just get the nodeValue public parameter (it is inherited from DOMNode):
<?php
echo $domElement->nodeValue;
?>
Everything is obvious if you now about this thing ;-)
Janne Enberg ¶
11 years ago
This page doesn't list the inherited properties from DOMNode, e.g. the quite important textContent property. It would be immensely helpful if it would list those as well.
dpetroff ( at ) gmail.com ¶
14 years ago
Hi!
Combining all th comments, the easiest way to get inner HTML of the node is to use this function:
<?php
function get_inner_html( $node ) {
$innerHTML= '';
$children = $node->childNodes;
foreach ($children as $child) {
$innerHTML .= $child->ownerDocument->saveXML( $child );
}
return $innerHTML;
}
?>
Daniel Morlock ¶
15 years ago
It would be nice to have a function which converts a document/node/element into a string.
Anyways, I use the following code snippet to get the innerHTML value of a DOMNode:
<?php
function getInnerHTML($Node)
{
$Body = $Node->ownerDocument->documentElement->firstChild->firstChild;
$Document = new DOMDocument();
$Document->appendChild($Document->importNode($Body,true));
return $Document->saveHTML();
}
?>
felix dot klee at inka dot de ¶
11 years ago
How to rename an element and preserve attributes:
<?php
// Changes the name of element $element to $newName.
function renameElement($element, $newName) {
$newElement = $element->ownerDocument->createElement($newName);
$parentElement = $element->parentNode;
$parentElement->insertBefore($newElement, $element);
$childNodes = $element->childNodes;
while ($childNodes->length > 0) {
$newElement->appendChild($childNodes->item(0));
}
$attributes = $element->attributes;
while ($attributes->length > 0) {
$attribute = $attributes->item(0);
if (!is_null($attribute->namespaceURI)) {
$newElement->setAttributeNS('http://www.w3.org/2000/xmlns/',
'xmlns:'.$attribute->prefix,
$attribute->namespaceURI);
}
$newElement->setAttributeNode($attribute);
}
$parentElement->removeChild($element);
}
function prettyPrint($d) {
$d->formatOutput = true;
echo '<pre>'.htmlspecialchars($d->saveXML()).'</pre>';
}
$d = new DOMDocument( '1.0' );
$d->loadXML('<?xml version="1.0"?>
<library>
<data a:foo="1" x="bar" xmlns:a="http://example.com/a">
<invite>
<username>jmansa</username>
<userid>1</userid>
</invite>
<update>1</update>
</data>
</library>');
$xpath = new DOMXPath($d);
$elements = $xpath->query('/library/data');
if ($elements->length == 1) {
$element = $elements->item(0);
renameElement($element, 'invites');
}
prettyPrint($d);
?>
patrick smith ¶
16 years ago
Although it may be preferable to use the dom to manipulate elements, sometimes it's useful to actually get the innerHTML from a document element (e.g. to load into a client-side editor).
To get the innerHTML of a specific element ($elem_id) in a specific html file ($filepath):
<?php
$innerHTML = '';
$doc = new DOMDocument();
$doc->loadHTMLFile($filepath);
$elem = $doc->getElementById($elem_id);
// loop through all childNodes, getting html
$children = $elem->childNodes;
foreach ($children as $child) {
$tmp_doc = new DOMDocument();
$tmp_doc->appendChild($tmp_doc->importNode($child,true));
$innerHTML .= $tmp_doc->saveHTML();
}
?>
ae.fxx ¶
16 years ago
Hi there.
Remember to append a DOMNode (or any of its descendants) to a DOMDocument __BEFORE__ you try to append a child to it.
I don't know why it has to be this way but it can't be done without it.
bye
nawaman at gmail dot com ¶
15 years ago
The following code shows can text-only content be extracted from a document.
<?php
function getTextFromNode($Node, $Text = "") {
if ($Node->tagName == null)
return $Text.$Node->textContent;
$Node = $Node->firstChild;
if ($Node != null)
$Text = getTextFromNode($Node, $Text);
while($Node->nextSibling != null) {
$Text = getTextFromNode($Node->nextSibling, $Text);
$Node = $Node->nextSibling;
}
return $Text;
}
function getTextFromDocument($DOMDoc) {
return getTextFromNode($DOMDoc->documentElement);
}
$Doc = new DOMDocument();
$Doc->loadHTMLFile("Test.html");
echo getTextFromDocument($Doc)."\n";
?>
Anonymous ¶
13 years ago
you can use DOMNode::nodeValue
DOMElement inherits this public property.
$elem->nodeValue
loopduplicate at burningtoken dot com ¶
13 years ago
This works perfect for me as well:
<?php $xml = $domElement->ownerDocument->saveXML($domElement); ?>
Severin ¶
16 years ago
I wanted to find similar Elements - thats why I built an Xpath-String like this - maybe somebody needs it... its not very pretty - but neither is domdocument :)
<?php
$dom->load($xmlFile))
$xpathQuery = '//*';
$xmlNodes = $xpath->query($xpathQuery);
$pathlist = array();
$attrlist = array();
foreach ($xmlNodes as $node) {
$depth = $this->_getDomDepth($node); //get Path-Depth (for array key)
$pathlist[$depth] = $node->tagName; // tagname
$attrs = $node->attributes;
$attr='';
$a=0;
foreach ($attrs as $attrName => $attrNode) // attributes
{
if ($attrName !='reg')
{
if ($a++!=0) $attr .= ' and ';
$attr .= '@'.$attrName.'='."'".$attrNode->value."'";
}
}
$attrlist[$depth] = $attr?'['.$attr.']':'';
$path = ''; for ($i=0;$i<=$depth;$i++) $path .= '/'.$pathlist[$i].$attrlist[$i]; // the xpath of the actual Element
// ... now you can go on and user $path to find similar elements
}
}
}
private function _getDomDepth(DomNode $node)
{
$r = -2;
while ($node) {
$r++;
$node = $node->parentNode;
}
return $r;
}
?>
